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A bipolar host based high triplet energy electroplex for an over 10 000 h lifetime in pure blue phosphorescent organic light-emitting diodes

Authors
Jung, MinaLee, Kyung HyungLee, Jun YeobKim, Taekyung
Issue Date
1-Feb-2020
Publisher
ROYAL SOC CHEMISTRY
Citation
MATERIALS HORIZONS, v.7, no.2, pp.559 - 565
Journal Title
MATERIALS HORIZONS
Volume
7
Number
2
Start Page
559
End Page
565
URI
https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/587
DOI
10.1039/c9mh01268k
ISSN
2051-6347
Abstract
Ultimate device performances of blue phosphorescent organic light-emitting diodes, an external quantum efficiency of 27.6%, a device lifetime over 10 000 h at 100 cd m(-2), and pure blue color coordinates of (0.12, 0.13), were simultaneously achieved using a device architecture employing an electroplex host. A high triplet energy electron transport type host derived from a triazine core, a carbazole substituent, and a triphenylsilyl blocking unit was newly synthesized for the purpose of developing the high emission energy electroplex host. The electroplex host functioned as a carrier balancing host for high external quantum efficiency and a lifetime extending host of pure blue phosphorescent organic light-emitting diodes. This work demonstrates ultimate device performances, high external quantum efficiency and long lifetime, in pure blue phosphorescent organic light-emitting diodes. In particular, the lifetime limit of pure blue phosphorescent organic light-emitting diodes was overcome by demonstrating an over 10 000 h lifetime.
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